#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<string.h>
void js(char *ch,char cy[])
{
	int len = strlen(ch);
	int i = 0;
	int j = 0;
	for (i = 0; i < len; i++)
	{
		if (ch[i] % 2 == 0)
		{
			cy[j++] = ch[i];
		}
	}
	cy[j] = '\0';
}
int main()
{
	char ch[80];
	char cy[80];
	gets(ch);
	
	js(ch, cy);
	printf("%s\n",cy);
	return 0;
}